[ADO.NET] DataGridView 内のデータ編集とそのときのバインドした DataTable の動作

Public ClassForm1

    Private Sub Form1_Load(sender As Object, e AsEventArgs) Handles MyBase.Load
       ‘ データソースから取得した値の DataTable を DataGridView へバインドします
       Me.TableAdapter1.Fill(Me.DataSet1.Table_1)
        DataGridView1.DataSource = Me.DataSet1.Table_1

    End Sub           
 
   Private Sub Button1_Click(sender As Object, e AsEventArgs) Handles Button1.Click
       For i As Integer = 0 To DataGridView1.RowCount - 1
            DataGridView1.Item("Col1DataGridViewCheckBoxColumn", i).Value = 1
        Next

      MessageBox.Show("選択数:"& DataSet1.Table_1.Compute("COUNT(col1)", "col1<>0") & "行選択されました。")
    End Sub

End Class

Private Sub Button1_Click(sender As Object, e AsEventArgs) Handles Button1.Click
    For i As Integer = 0 To DataGridView1.RowCount - 1             
        DataGridView1.Item("Col1DataGridViewCheckBoxColumn", i).Value = 1
    Next

    '対処策1
    Me.DataSet1.Table_1.Rows(DataGridView1.CurrentCell.RowIndex).EndEdit()

    MessageBox.Show("選択数:"& DataSet1.Table_1.Compute("COUNT(col1)", "col1<>0") & "行選択されました。")
End Sub

Private Sub Button1_Click(sender As Object, e AsEventArgs) Handles Button1.Click
    For i As Integer = 0 To DataGridView1.RowCount - 1             
        DataGridView1.Item("Col1DataGridViewCheckBoxColumn", i).Value = 1
    Next

    '対処策2
    Me.DataSet1.Table_1.AcceptChanges()

    MessageBox.Show("選択数:"& DataSet1.Table_1.Compute("COUNT(col1)", "col1<>0") & "行選択されました。")
End Sub

Private Sub Button1_Click(sender As Object, e AsEventArgs) Handles Button1.Click
    '対策3
    'For i As Integer = 0 To DataGridView1.RowCount - 1
    '    DataGridView1.Item("Col1DataGridViewCheckBoxColumn", i).Value = 1
    'Next
    For i As Integer = 0 To Me.DataSet1.Table_1.Rows.Count - 1
        Me.DataSet1.Table_1.Rows(i)(0) = 1
    Next

    MessageBox.Show("選択数:"& DataSet1.Table_1.Compute("COUNT(col1)", "col1<>0") & "行選択されました。")
End Sub